1. Go to Control Panel -> Power Option -> Advanced Settings and then set brightness to 28%

2. Do not change the size of Windows Media Player and do not set to full screen mode.

Please refer to the steps below1. Fully charge the battery of the notebook.2. Play the video clip stored on the HDD Drive continuously.Note:Please refer to the following to obtain the test media file.a. Visit http://it.jeita.or.jp/mobile/e/index.htmlb. Click 3. MPEG measurement file and then click MPEG file for JEITA Battery Run Time Measurement Method approx. 30MBc. Save the MPEG file onto the HDD Drive.3. Calculate the running time after unplugging the AC adaptor until the notebook shuts down automatically.For more information on JEITA A Battery Run Time Measurement Method for VAIO notebook, please visit the following website.http://it.jeita.or.jp/mobile/e/index.html